UCI Health will see you now: Welcome to our new co-workers and patients from Fountain Valley, Lakewood, Los Alamitos and Placentia Linda! 


Jack C. Sun, MD


Cardiac Surgery

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  • Royal College of Physicians & Surgeons of Canada, Thoracic and Cardiac Surgery - General
  • English
  • Mandarin
Medical School
University of Toronto
McMaster UniversityCardiac Surgery
Brigham and Women's HospitalTranscatheter Cardiovascular Surgery
Brigham & Womens Hospital
Professional Positions
  • Associate professor — Department of Surgery, UCI School of Medicine
  • Chief — Division of Cardiothoracic Surgery, Department of Surgery, UCI School of Medicine
  • Director — UCI Health Minimally Invasive Cardiac Surgery
  • Surgical Director — UCI Health Structural Heart Program
Awards and Recognition
  • Physicians of Excellence, Orange County Medical Association — 2023

More Information

Dr. Jack C.J. Sun is a UCI Health cardiothoracic surgeon who specializes in minimally invasive heart surgery, including coronary artery bypass, heart valve repair, and procedures to treat atrial fibrillation and arrhythmia. His clinical interests also include transcatheter cardiovascular surgery and transcatheter aortic valve replacement (TAVR).

Sun received his medical degree from the University of Toronto in Canada and finished residency training in cardiac surgery at McMaster University, also in Canada. He completed an advanced fellowship in cardiac surgery at the Brigham & Women's Hospital, a Harvard University-affiliated teaching hospital in Boston.

Before joining UCI Health to lead the cardiovascular surgery team, Sun was on the faculty of the Keck School of Medicine at USC and served as the director of cardiothoracic surgery at Torrance Memorial Medical Center. Before joining USC, he was on the faculty at the University of Washington in Seattle.

Sun, who is chief of the UCI School of Medicine’s Division of Cardiothoracic Surgery, see patients in Orange, Irvine and Laguna Hills.

UCI Health Cardiovascular Center
101 The City Drive South, Pavilion 4
Building 25
Orange, CA 92868
Phone: 714-456-6699
Fax: 855-209-8413
UCI Health Gottschalk Medical Plaza
1 Medical Plaza Drive
Irvine, CA 92697
Phone: 949-824-8600
Fax: 855-209-8413
UCI Health — Laguna Hills
23961 Calle de la Magdalena, Suite 200
Laguna Hills, CA 92653
Phone: 949-238-4100
Fax: 866-251-1363